Unidentified reboot problem, can I please get some assistance?

A

AC Question

unidentified reboot problem

My s3 mini just got repaired. the last problem was it won't turn on. Now , it does turn on but it occasionally reboots, not only that but every time it reboots all my data, may it be photos, applications or anything will be retrieved. anti-virus can be run but before it finished it will reboot, developer options is not accessible. All will reset from before it won't turn on after. help me fix this problem please. factory reset doesn't work as well as long as it reboots. When internet is open, update can be access but firmware requires reboot so when the phone reboots, it will go back to how it was before it was repaired.
 

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